You can do partial of the attach element through the Accounts Administration follow the below steps, this will turn on the scan function:
From the Main Menu go to the Accounts Administration.
Go to the SYSTEM SETTINGS tab.
Accounts Scanning tab.
select UPDATE and tick the box Enable Accounts Scanning(Purchase Invoices etc).
click SAVE.
If you require the Attach function enabling too not just to be able to scan then you will need to log a new case online and reference the title of this article.